Ore-concentrator



UNITED STATES PATENT OFFICE.

y WILLIAM THURMONI), OE EOsIIA, COLORADO.

ORE-CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 248,284, dated October 11, 1881.

Application filed March 7, 1881.

To all whom it may concer-n:

Be it known that I, WILLIAM THURMOND, of Rosita, in the county of Custer and State of Colorado, have invented a new and Improved Ore-Concentrator, of which the following is a specification.

The object of this invention is to provide an improved device for the concentration of ores `by means of screens and air-currents.

The invention consists of a frame in which are fixed screens of various degrees ofiineness, movably supported in the longitudinal axis of a boxthat is open at both ends, and is designed to be connected at one end with an exhaustfan, said box being provided with suitable devices for regulating and directing the current of air passing through it for the purpose of acting upon the ores to be concentrated.

Figure l is a longitudinal sectional elevation of the device. Fig. 2 isa plan of the same with parts broken away to exhibit other parts.

Similar let-ters of reference indicate corresponding parts. Y

In the drawings, A represents a rectangular frame, in which are ixed screensB B, of different grades, suspended nearly horizontally within a box, C, by links c, from transverse rods b, that end of said frame A which extends beyond the receiving-end of the box C being provided with an eye or loop, c, for the attachment of the mechanism by means ot'which said frame A is to be rocked back and forth in the longitudinal axis of said box C. The said box C is constructed, preferably, with a V-shaped chamber, d, having an enlarged cylindrical chamber, f, attached transversely toits smaller end, from which cylindrical chamber f, opposite its connection With the chamber d,is extended 'an open neck, g, for the convenient attachment of said box C to an exhaust-fan.

In the bottom ot' the box C, beneath the screens B B, are open necks or chutes h, into and through which the ore passing through said screens B falls to be conducted thereby into suitable receptacles.

In the bottom of thecylindrical chamber f is a like chute, 7c, which is designed to conduct the gangue falling therein into a proper receptacle.

From the lower side of the second chute h an inclined plane, l, is extended upward to- (Model.)

ward the coa-rsest and last screen B, for'the purpose of checking the current of air passing through the device and deiiecting itup through said coarse screen B.

At the larger and receiving end of the box U the sides thereof are grooved, as shown at m, and in these grooves m a vertical slide, E, may be adjusted to regulate the passage of air through the said box C.

Any number of screens B may be used, the nest of them being nearest the large receiving end of the box (l, where the ore enters, and each succeeding screen B being a little coarser than the preceding one. The frame A may be suspended, as shown, or may be made to rest on rollers Iixed Within said box C, and be oscillated or rocked back and forth by any B, on which is the coarser ore, the ner particles ot' ore and other material having passed through the preceding finer screens B into the receptacles placed to receive them.

The dustand lightest particles of the'ore are drawn by the current ot air through the neck g and expelled through the exhaustfan. (Not shown.) In the enlarged cylindrical chamber fthe air passing through the device is expanded, thereby permitting the coarser particles of gan gue or Worthless material to settle or fall into the chute 7c, from which they may be removed at Will.

The object in concentrating and thereby increasing the force of the current of air as it reaches the coarser screens B is that the air may better buoy up the coarse particles of worthless material and conduct them into the.

IOO

ery, or to receive the ore directly from them, the ore havin g first passed through the Crusher.

It will be seen that in this concentrator the current of air moves upward and forward at thesame time, and that its foreelcan easily be graduated or regulated.

Having thus fullT described my invention, I claim as new and desire to secure by Letters Patent- 1. An ore-concentrator constructed substantially as herein shown and described, consisting of rocking or vibrating frame A, provided with screens B B, movablysupported in aboX, C, constructed With V-shaped chamber d, that terminates in an enlarged chamber, f, operated as set forth.

2. In an ore-concentrator, the combination, 

